A psilocybin bar is a type of bar that specializes in serving psilocybin-infused drinks. Psilocybin is a naturally occurring psychedelic compound found in certain types of mushrooms. When consumed, psilocybin can cause changes in perception, mood, and cognition. Some people report experiencing mystical or religious experiences while under the influence of psilocybin. Some bars also offer other psychedelic-infused drinks, such as ayahuasca and LSD.